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A227726 as a simple table

na(n)
01
14
220
3112
4660
54004
624752
7155040
8980628
96249100
1040060020
11258048960
121668903600
1310829900592
1470480305440
15459823234112
163006465218196
1719694758782300
18129235131438140
19849311959095600
205589126007740660
2136825913869817380
22242910890642347200

[1,4,20,112,660,4004,24752,155040,980628,6249100,
 40060020,258048960,1668903600,10829900592,
 70480305440,459823234112,3006465218196,
 19694758782300,129235131438140,849311959095600,
 5589126007740660,36825913869817380,
 242910890642347200]